William moses



. W. MOSES. LOOK-UP SAFETY VALVE.

No. 98,991. Patented Jan. 18. 1870 (Etched slam fitted dtjiii i112.

WILLIAMdMO SES, OF BUFFALO NEW YORK.-

Letters Patent No. 98,991, dated January 18, 1870.

l I LOCK-UP SAFETY-VALVE.

The Schedule referred to in these Letters Patent and making part of the same.

I, NIIQLIAM Mosns, of the city of 'Bufialo, in the county of Erie, 'and State of New York, have invented an Improved Lock-Up Safety -Valve for Steam-Boilers, 9; which the following is aspecitication.

My invention has for its objectthe guiding of the movements of the valve and valve-lever, in a manner to prevent all undue binding and friction, and insure their uniform and reliable operation, and at the same time to secure a construction at once cheap, simple, and durable. i

-i'T-he invention consists in the combination. of three devices, by the conjoined action of which the above 1 objects are accomplished:

'First, a disk-valve,iharing a stern projecting botlh above and below the-disk. v Second,a valve-seat and lower guide for valvestem, cast together in one piece.

Third, an upper guide-plate, provided with lugs for fulcrum-pin, and guide-jaws for valve-lever, and apertures for the escape of steam.

n the accompanying drawings, which form part of his sp cification a-Fignre I is a vertical longitudinal section-of my improved safety-valve;

Figure'II is a horizontal section of same on linen; 25, Fig. I; and

FigureIII, a cross-section of valve-seat on line yy, Fig. 11.

Like letters refer tolike parts in each of the figures. A repres'entsthc escape-steam pipe, connecting with the boiler, and B the valve, for .closing theorifice thereof. e 0 represents the valve-lever, and (Z the weight by which the valve is retained'in its s'eat.

;-The valve-lever and weight are enclosed :in a box, E E, said box being made in two parts, the divisionline being in the planeof the bottom E, which is cast with the pipe A.

'ing lugs f outhe side plates of the cover. The pin F has a head at one end and an eye at the other, for the reception of a padlock, or other sealing-lock, so that the box may be securely locked, and the internal parts rendered inaccessible to other than the proper authorities. 4 A steam-escape, G, is made in the top of the case, and a covering-plate, G, to prevent access to the parts enclosing-case. The upper or covering-part E of the box, is secured to the bottom by a locking-pin, F, passing. through I the eye-lugs f" on thebottom plate, and correspond-- through this aperture, this being a common construction in this class of safety-valves. M

' A"lifting-rod, H, is also provided, to enable the en- .gineerto relieve the valve when required. This is This plate has apertures, j, for the passage of the escaping steam through it, an'd also a concentric hole,

for the passage andguidanceof the upper projection b of the valve-stem. The valve B, being thus guided above and below, its accurate seating is insured, and all liability to stick or become displaced is obviated.

Lugs'j are cast with the plate at one side, to which the valve-lever '0 ishinged by the fulcrum-pin c.

A guide-jaw, K, is cast at the other side of the plate,.to prevent any lateral motion, and consequent binding of the valve-lever. The valve-lever acts on the valve through the intervention of a steel bearingpoint, inserted in the upper projection b of the valvestem, and formingpart thereof, andjhat' portion of the valve-lever, between" its fulcrum and the guidejaw, is curved upwardly, so that'this bearing-point may he in a straight line passing through the fulcrum and the centre of the weight, or nearly so, thus reducing the slip on the bearing-poiut to the minimum.

"In addition .to the apertures j in plate J, lateral openings, 1, are cut in the pipe A, just above the valve, to insure the free escape of the steam into the Having thus fully described my invention, What I claim, and desired to secure byLetters Patent, is

The upper guide-plate J, having steam-apertures j,

fulcrum-lugs J, and guide-jaw K, when combined with double-stem steam-valve B, valve-seat I t, valvelever O, and steam-escape pipe A, and the whole constructed and arranged as hereinbefore set forth.

Witnesses: WILLIAM MOSES.

W. H. FORBUSH, JAY 'HYATT. 

